JP2007269308A - Interior trimming material for aircraft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light weight interior trimming material for aircraft, which has a sufficient kinematic characteristic as an aircraft material, restricts spread of a fire when the fire occurs and restricts occurrence of toxic gas. <P>SOLUTION: This interior trimming material for aircraft includes, as a constituent element, a fiber-reinforced thermoplastic resin member (I), in which carbon fiber (A) having a weight average fiber length (Lw) in a range of 1 to 15 mm is contained in a thermoplastic resin (B) in an amount of weight inclusion rate of 25 to 80 wt.% and is dispersed as a short fiber. Bending elasticity modulus of the fiber-reinforced thermoplastic resin member (I) measured by ISO 178 method is in a range of 20 to 50 GPa, and an amount of generated gas at the time of combustion for 20 minutes measured by ASTM E662 is in a range of 0 to 100. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an aircraft interior material, which is lightweight and has high mechanical characteristics, and more specifically, has a high elastic modulus, so that it is possible to reduce the weight by thinning and secure a cabin space, and to have excellent characteristic stability and cabin. The present invention relates to an aircraft interior material that suppresses the generation of flammable gas and toxic gas in the event of a fire inside.

  In recent years, there has been a strong demand for weight reduction of mobile objects such as automobiles, motorcycles, and aircraft. This is due to the reduction of the amount of exhaust gas due to improved fuel efficiency, fuel cost reduction, and increased cruising range. This trend is expected to accelerate in the future. Therefore, a fiber reinforced resin material is adopted from a metal material as a material of these moving bodies, and the use of a carbon fiber composite material that is particularly lightweight and excellent in mechanical properties is increasing. For example, an aircraft structural material is being replaced by an aluminum alloy with a thermosetting resin material reinforced with continuous carbon fibers.

  On the other hand, from the viewpoint of lightweight aircraft, it is important to reduce the weight not only in the structural material but also in the cabin. In particular, interior materials such as interior panels that protect the entire cabin, baggage locker walls, and seats are used in large quantities, and lightweight materials are required. Here, it is possible to increase the bending rigidity by increasing the thickness of the molded product using a foam material or the like, but in this case, not only the cabin space becomes extremely narrow but also the weight increases due to the increase in thickness. There is concern.

  Also, when considering aircraft materials, safety should be the top priority. Especially for passenger aircraft, fire prevention and flame retardant measures are taken in the cabin. However, since the interior material uses a large amount of fuming thermoplastic resin, generation of combustible gas and toxic gas due to heat generation in a fire becomes a problem.

In order to prevent the spread of fire and the generation of toxic gas in the event of such a problem, Patent Document 1 discloses an interior laminate in which a sheet containing ceramic fibers and a metal foil are laminated. Although this method can be used as an aircraft material in terms of mechanical properties and stability, it is difficult to satisfy light weight because a metal material is used.
JP-A-8-276536 (2nd page, 2nd line)

  In view of the conventional technology, an object of the present invention is to provide an aircraft interior material that has thin and light weight and sufficient mechanical properties as an aircraft material, and that suppresses the spread of fire and generation of toxic gas in a fire.

In order to achieve the above object, the present invention employs the following configuration. That is,
(1) Carbon fiber (A) whose weight average fiber length (Lw) is in the range of 1 to 15 mm is in the form of single fiber in the range of 25 to 80% by weight in the thermoplastic resin (B). An aircraft interior material including a dispersed fiber reinforced thermoplastic resin member (I) as a constituent element, wherein the fiber reinforced thermoplastic resin member (I) has a flexural modulus of 20 to 50 GPa as measured by the ISO 178 method. An aircraft interior material that is in a range and the amount of gas generated during 20-minute combustion measured by ASTM E662 is in the range of 0 to 100.

  (2) The aircraft interior material according to (1), wherein a dispersion parameter of the carbon fiber (A) is in a range of 0 to 30%.

  (3) The ratio of the weight average fiber length (Lw) and the number average fiber length (Ln) of the carbon fiber (Lw / Ln) is in the range of 1 to 4, for aircrafts according to (1) or (2) Interior material.

  (4) The aircraft interior material according to any one of (1) to (3), wherein weight loss of the thermoplastic resin (B) by heating satisfies the following formula.

ΔWr = (W1-W2) /W1×100≦0.18 (%)
(Here, ΔWr is the weight loss rate (%), and thermogravimetric analysis was performed at a temperature rising rate of 20 ° C./min from 50 ° C. to an arbitrary temperature of 330 ° C. or higher in a non-oxidizing atmosphere at normal pressure. (It is a value obtained from the sample weight (W2) when reaching 330 ° C. based on the sample weight (W1) when reaching 100 ° C.)
(5) The thermoplastic resin (B) is at least one selected from polyetheretherketone resin, polyetherimide resin, polyethersulfone resin, and polyarylene sulfide resin. (1) to (4) The aircraft interior material according to any one of the above.

  (6) The thermoplastic resin (B) is a polyarylene sulfide resin, and the dispersity represented by the weight average molecular weight / number average molecular weight of the polyarylene sulfide resin is 2.5 or less. (5) Aircraft interior materials described in 1.

  (7) The aircraft interior material according to any one of (1) to (6), wherein a void ratio of the fiber-reinforced thermoplastic resin member (I) is in a range of 0 to 5%.

  (8) The aircraft interior material according to any one of (1) to (7), wherein a variation rate of a flexural modulus is in a range of 0 to 20%.

  (9) The aircraft interior material according to any one of (1) to (8), wherein the bending strength measured by the ISO 178 method of the fiber-reinforced thermoplastic resin member (I) is in a range of 200 to 1000 MPa.

  (10) The aircraft interior material according to (9), wherein a variation rate of bending strength is in a range of 0 to 20%.

  (11) The aircraft interior material according to any one of (1) to (10), wherein the density of the fiber-reinforced thermoplastic resin member (I) is in the range of 1.3 to 1.8.

  (12) The aircraft interior material according to any one of (1) to (11), wherein the member (II) made of continuous fiber reinforced resin is further integrated.

(13) The aircraft interior material according to any one of (1) to (12), wherein the skin material (III) is further integrated.
It is.

  The aircraft interior material according to the present invention is composed of carbon fiber and a thermoplastic resin, so that it can have both thin and lightweight properties and sufficient mechanical properties for shape maintenance. In addition, when used as an interior material, it is possible to prevent disasters caused by flammable gas and toxic gas in a fire inside and outside the cabin.

  Hereinafter, the aircraft interior material of the present invention will be described in more detail.

  In the aircraft interior material of the present invention, the carbon fiber (A) whose weight average fiber length (Lw) is in the range of 1 to 15 mm is in the thermoplastic resin (B) and the weight content is in the range of 25 to 80% by weight. The fiber-reinforced thermoplastic resin member (I) dispersed in a single fiber is included as a constituent element. This fiber reinforced thermoplastic resin member (I) is lightweight and excellent in mechanical properties by being reinforced with carbon fiber (A), and by using a thermoplastic resin as a matrix resin, the interior material can be easily used like a hot press. Can be manufactured in a simple process.

  Here, as the carbon fiber (A), for example, a PAN-based carbon fiber using polyacrylonitrile fiber as a raw material, a pitch-based carbon fiber using coal tar or petroleum pitch as a raw material, viscose rayon, cellulose acetate or the like is used as a raw material. Examples thereof include cellulosic carbon fibers and vapor grown carbon fibers made from hydrocarbons as raw materials. Furthermore, these graphite fibers may be used. Also, these are coated with at least one layer of metal such as nickel, ytterbium, gold, silver and copper by plating (electrolysis, electroless), CVD, PVD, ion plating and vapor deposition. Metal-coated carbon fiber may be used. Two or more of these may be blended. Of these, PAN-based carbon fibers that are excellent in balance between mechanical properties such as strength and elastic modulus and cost are particularly preferably used.

  The carbon fiber (A) contained in the fiber reinforced thermoplastic resin member (I) is dispersed in a single fiber form in the thermoplastic resin. By adopting a dispersed form, a complicated shape can be formed easily and at low cost. Here, the single fiber-like carbon fiber is dispersed in the thermoplastic resin, as shown in FIG. 1, in the thickness cross section of the fiber reinforced thermoplastic resin member (I), the carbon fiber is substantially uneven. It shows a state of being uniformly dispersed. As shown in FIG. 2, when the fiber reinforced thermoplastic resin member (I) is not dispersed in the form of single fibers, that is, when the carbon fibers are present in a bundle, there is no carbon fiber over a wide area and only the resin is present. The part (henceforth a resin rich part) comprised will generate | occur | produce and dispersion | variation will arise in dispersion | distribution of carbon fiber. In addition, since the thermoplastic resin has a high melt viscosity, when the carbon fibers are present in a bundle state, a portion of the carbon fiber bundle that is not sufficiently impregnated with the thermoplastic resin (hereinafter, may be referred to as an unimpregnated portion). Arise. When such a resin-rich portion or an unimpregnated portion is present in the fiber-reinforced thermoplastic resin member (I), it may become a starting point of fracture under a load and may not sufficiently exhibit mechanical properties.

  In the present invention, a state in which the dispersion parameter of the carbon fiber indicated by “the variation in the number of carbon fibers” indicating the dispersion state of the carbon fiber in the fiber reinforced thermoplastic resin member (I) is preferably 0 to 30%, 0 to 20% is more preferable, and 0 to 10% is particularly preferable.

  This “variation in the number of carbon fibers” is a value measured by the following method. A part of the thickness cross section of the fiber reinforced thermoplastic resin member (I) is cut out and polished to prepare an observation test piece. The cross section of the fiber reinforced thermoplastic resin member (I) obtained by polishing was observed with an optical microscope, and a range of 0.1 mm × 0.1 mm was randomly selected at 10 locations, and the carbon fibers contained in the range were selected. Measure the number. The average value of the number of selected 10 carbon fibers is n, the standard deviation is σ, and the variation in the number of carbon fibers is obtained by the following equation.

  Variation in number of carbon fibers (%) = 100 × n / σ.

  The method for dispersing the carbon fibers into a single fiber is not particularly limited. For example, (1) a carbon fiber bundle having a chopped form and a thermoplastic resin are mixed under an air flow jet, and the mixture is placed on a conveyor belt. Airflow jet method that heats while accumulating and transporting, (2) Extrusion method in which carbon fiber bundle and thermoplastic resin are supplied to an extruder and kneaded, (3) Carbon fiber bundle and thermoplastic resin having a chopped form are liquidized The paper is made by dispersing and mixing, making paper on a perforated support, heating and pressurizing, and (4) opening a carbon fiber bundle having a chopped form and a thermoplastic resin with a card machine to create a fiber web. Examples of the carding method include heating and pressurizing after the needle punch treatment. In the present invention, more preferably, an air jet method or a paper making method is used, which is excellent in dispersibility of carbon fibers and can keep the fiber length of the carbon fibers long, and more preferably from the viewpoint of productivity, A papermaking method is used.

  Here, the fiber length of the carbon fibers dispersed in the fiber reinforced thermoplastic resin member (I) is in the range of 1 to 15 mm in weight average fiber length (Lw), preferably in the range of 1.5 to 10 mm. Of these, more preferably in the range of 2 to 5 mm. If the weight average fiber length (Lw) is shorter than 1 mm, sufficient mechanical properties may not be obtained. If the weight average fiber length (Lw) is longer than 15 mm, steric hindrance may occur due to entanglement of carbon fibers, In some cases, sufficient mechanical properties cannot be obtained due to many voids remaining.

  Here, the weight average fiber length (Lw) is measured by randomly extracting at least 400 carbon fibers in the fiber reinforced thermoplastic resin member (I) at random, and measuring the length up to 1 μm unit with an optical microscope. Or it measures by a scanning electron microscope and calculates by calculating the weight average length. As a method for extracting the carbon fiber, a part of the fiber reinforced thermoplastic resin member (I) is cut out, the thermoplastic resin is sufficiently dissolved with a solvent for dissolving the thermoplastic resin as the matrix resin, and then a known method such as filtration is used. Examples thereof include a method of separating from carbon fibers by operation, and a method of cutting out a part of the fiber reinforced thermoplastic resin member (I) and removing the thermoplastic resin by incineration and removal in a heating furnace.

  Furthermore, in the present invention, the ratio (Lw / Ln) of the weight average fiber length (Lw) to the number average fiber length (Ln) of the carbon fiber is in the range of 1 to 4 from the viewpoint of sufficiently improving the mechanical properties. Preferably, it is in the range of 1 to 3.5, more preferably in the range of 1 to 3. Here, when the ratio (Lw / Ln) of the weight average fiber length (Lw) to the number average fiber length (Ln) is 1, it means that it is composed of only fibers of the same length, and Lw / Ln increases. This means that the fiber length distribution becomes wider.

  The weight content of the carbon fibers in the fiber reinforced thermoplastic resin member (I) in the present invention is in the range of 25 to 80% by weight, preferably in the range of 30 to 75% by weight, and more preferably in the range of 35 to 70% by weight. % Range. If the carbon fiber weight content is less than 25% by weight, the elastic modulus of the fiber reinforced thermoplastic resin member (I) may be insufficient. If the weight content exceeds 80% by weight, the fiber reinforced thermoplastic resin may be insufficient. A void may occur in the member (I). The weight content of the carbon fiber in the fiber reinforced thermoplastic resin member (I) is determined by the blending amount, but the carbon fiber is extracted from the molded product by the method used in the measurement of the weight average fiber length. You may obtain | require a weight ratio. In addition, in a known operation such as filtration, it is preferable to sufficiently separate fillers other than carbon fibers, carbides of thermoplastic resins, and the like because more accurate weight content can be obtained.

  The flexural modulus measured based on ISO 178 of the fiber reinforced thermoplastic resin member (I) is in the range of 20 to 50 GPa, preferably in the range of 25 to 45 GPa, more preferably from the viewpoint of lightweight design. 30-40 GPa. If the flexural modulus is less than 20 GPa, it may be insufficient from the viewpoint of thin and light weight that is the object of the present invention. If the upper limit of the flexural modulus is 50 GPa or less, the effects of the present invention can be sufficiently achieved while satisfying economic efficiency.

  Further, the fiber-reinforced thermoplastic resin member (I) has a generated gas amount in the range of 0 to 100 when burned for 20 minutes as measured by ASTM E662. This amount of generated gas is optically measured as the amount of smoke generated when combustion is performed for 20 minutes by applying only the specified amount of heat in the flameless mode when tested only with the fiber reinforced thermoplastic resin member (I) in the aircraft interior material. It is an evaluated index. The combustion referred to here does not necessarily have to be accompanied by ignition. If the amount of generated gas exceeds 100, there may be a secondary fire spread of the fire due to the flammable gas, damage to the passengers and passengers due to the toxic gas at the time of fire inside and outside the cabin, at the time of initial fire extinguishing and at the spread of fire. Accordingly, the amount of generated gas is desirably low, preferably in the range of 0 to 80, and particularly preferably in the range of 0 to 60.

  As a thermoplastic resin (B) used for this invention, it is preferable that the weight reduction by heating satisfy | fills following formula (1).

ΔWr = (W1-W2) /W1×100≦0.18 (%) (1)
Here, ΔWr is a weight reduction rate (%), and when thermogravimetric analysis was performed at a temperature increase rate of 20 ° C./min from 50 ° C. to an arbitrary temperature of 330 ° C. or higher in a non-oxidizing atmosphere at normal pressure. The value obtained from the sample weight (W2) when reaching 330 ° C. with reference to the sample weight (W1) when reaching 100 ° C.

  From the viewpoint of suppressing the amount of generated gas, ΔWr is preferably as low as possible, more preferably 0.12% or less, further preferably 0.10% or less, and more preferably 0.085% or less. Even more preferable.

  ΔWr can be obtained by a general thermogravimetric analysis, and the atmosphere in this analysis is a normal pressure non-oxidizing atmosphere. The non-oxidizing atmosphere indicates an atmosphere that substantially does not contain oxygen, that is, an inert gas atmosphere such as nitrogen, helium, or argon.

  In the measurement of ΔWr, thermogravimetric analysis is performed by increasing the temperature from 50 ° C. to an arbitrary temperature of 330 ° C. or higher at a temperature increase rate of 20 ° C./min. In the present invention, thermogravimetric analysis is performed by holding at 50 ° C. for 1 minute and then increasing the temperature at a rate of temperature increase of 20 ° C./min.

  Examples of the thermoplastic resin (B) used in the present invention include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), and polyester such as liquid crystal polyester. In addition to polyolefins such as polyethylene (PE), polypropylene (PP), polybutylene, and styrene resins, polyoxymethylene (POM), polyamide (PA), polycarbonate (PC), polymethyl methacrylate (PMMA), poly Vinyl chloride (PVC), polyarylene sulfide (PAS), polyphenylene ether (PPE), modified PPE, polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSU) , Modified PSU, polyethersulfone (PES), polyketone (PK), polyetherketone (PEK), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polyarylate (PAR), polyethernitrile ( PEN), phenolic resins, phenoxy resins, polytetrafluoroethylene and other fluorine resins, as well as polystyrene, polyolefin, polyurethane, polyester, polyamide, polybutadiene, polyisoprene, fluorine, acrylonitrile, etc. Thermoplastic elastomers, and the like, copolymers, modified products, and resins blended in two or more types can be used. From the viewpoint of suppressing the amount of generated gas, which is the object of the present invention, Heat from heating plastic resin From the viewpoint of suppressing the amount, PEEK, PEI, PES, PAS is preferably used. Furthermore, PEI and PAS are more preferably used from the viewpoint of molding processability and economy.

  Here, for the purpose of reducing weight loss due to heating, a method of extracting impurities, unreacted monomers, oligomers, and low molecular weight components may be used. For example, there may be mentioned a method in which the solvent is heated to a solvent phase mainly at a temperature higher than the temperature at which the thermoplastic resin melts, and a method of purifying by heating, or a method in which a granular polymer is precipitated and recovered after cooling.

  Similarly, for the purpose of reducing weight loss due to heating, it is preferable to produce by a method of suppressing impurities, unreacted monomers, oligomers and low molecular weight substances. For example, the weight reduction of PAS can be reduced by a production method in which a polyarylene sulfide prepolymer containing a cyclic polyarylene sulfide is heated to be converted into a high degree of polymerization.

  The weight average molecular weight of the thermoplastic resin is not particularly limited, but is preferably 2,000 to 200,000, more preferably 5,000 to 150,000, from the viewpoint of the mechanical properties of the aircraft interior material. More preferably, it is 10,000-100,000.

  Further, the molecular weight distribution of the polyarylene sulfide resin preferably used as the thermoplastic resin, that is, the degree of dispersion represented by the ratio of the weight average molecular weight to the number average molecular weight (weight average molecular weight / number average molecular weight) is 2.5 or less. Is preferably 2.3 or less, more preferably 2.1 or less, and even more preferably 2.0 or less. It is preferable to suppress the dispersity to 2.5 or less from the viewpoint of suppressing the generation of toxic gas, which is an object of the present invention, since the low molecular weight component contained in the polyarylene sulfide resin is small. In addition, the said weight average molecular weight and number average molecular weight can be calculated | required, for example using SEC (size exclusion chromatography) equipped with the differential refractive index detector.

  From the viewpoint of enhancing functionality, a filler or an additive may be added to the thermoplastic resin. For example, flame retardants, conductivity imparting agents, crystal nucleating agents, ultraviolet absorbers, antioxidants, vibration damping agents, antibacterial agents, insect repellents, deodorants, coloring inhibitors, heat stabilizers, mold release agents, antistatic agents Plasticizers, lubricants, colorants, pigments, dyes, foaming agents, antifoaming agents and coupling agents. In particular, when an inorganic substance is added, a smaller dispersion size is more preferable from the viewpoint of adhesion to carbon fibers. In particular, a material having a nano-order dispersion size is a more preferable embodiment from the viewpoint that a function improving effect can be expressed by addition of a small amount.

  Furthermore, the void ratio of the molded product measured based on JIS K 7075 (1991) of the fiber reinforced thermoplastic resin member (I) is preferably in the range of 0 to 5%, more preferably from the viewpoint of mechanical properties. It is in the range of 0 to 3%, more preferably in the range of 0 to 2%. As a method for adjusting the void ratio in the fiber reinforced thermoplastic resin member (I) to a preferable range, there is no particular limitation. However, the dispersion of the carbon fiber is sufficiently increased, and the heating and pressure during molding are in an appropriate range. Can be set.

  Further, from the viewpoint of increasing the reliability of the flexural modulus of the fiber reinforced thermoplastic resin member (I), the flexural modulus is preferably isotropic, and the variation rate of the flexural modulus is 0 to 20%. Is preferably in the range of 0 to 15%, more preferably in the range of 0 to 10%, and most preferably 0%. Here, the variation rate means that a test piece is cut out from the fiber reinforced thermoplastic resin member (I) in a plurality of directions (at least one arbitrary direction and 90 degrees direction thereof), and the average value a and the standard deviation σ of the number of measurements are used. The rate of change (%) is obtained using the following equation.

Fluctuation rate = 100 × σ / a
Here, the method for adjusting the fluctuation rate within a preferable range is not particularly limited, but a method preferable from two viewpoints is shown. That is, (1) the state of the test piece is a structure that sufficiently develops mechanical properties, and (2) the reinforcing fibers are arranged substantially uniformly in any direction of the test piece. For (1), a method for preventing foreign matter from being mixed in the manufacturing process, a method for removing voids in the defoaming process, a method for increasing the dispersibility of reinforcing fibers so that resin-rich portions and unimpregnated portions are not formed, and reinforcing fibers Examples thereof include a method of cutting the fiber length within a preferable range so as not to bend. For (2), there are a method in which the orientation of the reinforcing fibers is randomly made in the process of manufacturing the molded substrate, a method in which a preform is laminated so that the directions of the reinforcing fibers are substantially uniform, and the like. Can be mentioned.

  Similarly, the bending strength measured based on the ISO 178 method of the fiber reinforced thermoplastic resin member (I) is preferably in the range of 200 to 1000 MPa, more preferably in the range of 300 to 900 MPa, and still more preferably. The range is 400 to 800 MPa. Also here, the bending strength variation rate is preferably in the range of 0 to 20%, more preferably in the range of 0 to 15%, still more preferably in the range of 0 to 10%, and most preferably. Is 0%.

  The density of the fiber reinforced thermoplastic resin member (I) is preferably in the range of 1.3 to 1.8, more preferably in the range of 1.35 to 1.75, from the viewpoint of lightweight design. More preferably, it is the range of 1.4-1.7.

  The fiber-reinforced thermoplastic resin member (I) may be formed with an uneven shape from the viewpoint of increasing rigidity as an aircraft interior material. Examples of the concavo-convex shape include a mountain shape, a round shape, a wave shape, a square shape, a W shape, an M shape, an I shape, an H shape, and a trapezoid shape. The height of the unevenness is preferably in the range of 10 to 70 mm, more preferably in the range of 10 to 50 mm, and still more preferably in the range of 10 to 30 mm.

  Furthermore, from the viewpoint of reinforcing the rigidity of the fiber reinforced thermoplastic resin member (I), the member (II) composed of the continuous fiber reinforced resin may be integrated. Here, the member (II) is composed of continuous reinforcing fibers and a matrix resin. Here, the continuous reinforcing fiber is composed of a large number of filaments continuous in a length of 20 mm or more in at least one direction, or in the case of a member having a laminated structure, 90% of the reinforcing fibers of each layer. % Or more indicate those having no cutting portion other than the end portion of the member, and it is not necessary that all the filaments are continuous over the entire member, and some of the filaments may be divided in the middle.

  Examples of the continuous reinforcing fibers include metal fibers such as aluminum fibers, brass fibers, and stainless fibers, aromatic polyamide fibers, polyaramid fibers, PBO fibers, polyphenylene sulfide fibers, polyester fibers, acrylic fibers, nylon fibers, and polyethylene fibers. Organic fibers, and inorganic fibers such as glass fibers, polyacrylonitrile-based, rayon-based, lignin-based, pitch-based carbon fibers and graphite fibers, silicon carbide fibers, silicon nitride fibers, alumina fibers, silicon carbide fibers, and boron fibers There is. These are used alone or in combination of two or more. These fiber materials may be subjected to surface treatment. Examples of the surface treatment include a metal deposition treatment, a treatment with a coupling agent, a treatment with a sizing agent, and an additive adhesion treatment. As the fiber material, carbon fiber having a small specific gravity, high strength and high elastic modulus is preferably used.

  Examples of the form of the reinforcing fiber include a filament bundle (fiber bundle) composed of a large number of filaments, a cloth composed of the fiber bundle, and a filament bundle (unidirectional fiber bundle) in which a large number of filaments are arranged in one direction. ), There is a unidirectional cloth composed of this unidirectional fiber bundle. From the viewpoints of mechanical properties, designability and productivity, cloth and unidirectional fiber bundles are preferable. The reinforcing fiber may be composed of a plurality of fiber bundles having the same form or may be composed of a plurality of fiber bundles having different forms.

  As the matrix resin of the member (II), either a thermosetting resin or a thermoplastic resin can be used, but it is preferable to use a thermosetting resin from the viewpoint of the rigidity, strength, heat resistance, etc. of the molded body. .

  As the thermosetting resin, for example, unsaturated polyester, vinyl ester, epoxy, phenol (resole type), urea / melamine, polyimide, and the like can be preferably used. In addition, these copolymers, modified products, and / or resins obtained by blending two or more of these may be used. Among these, an epoxy resin is particularly preferable from the viewpoints of mechanical properties of the molded body and heat resistance. Furthermore, the epoxy resin is preferably contained as a main component in order to exhibit its excellent mechanical properties, and specifically, it is preferably contained in an amount of 60% by weight or more per resin composition.

  Moreover, specific examples of the thermoplastic resin (B) can be given as the thermoplastic resin, but PEEK, PEI, polyethersulfone, PAS are used from the viewpoint of suppressing the amount of generated gas which is the object of the present invention. Are preferably used. In particular, the above resin having a low weight loss due to heating is more preferably used.

  The form of integration of the fiber reinforced thermoplastic resin member (I) and the member (II) is not particularly limited, and the member (II) is integrated with a part of the fiber reinforced thermoplastic resin member (I). The laminated form in which the member (II) is integrated on the entire surface of one side of the fiber reinforced thermoplastic resin member (I), and further, the member (II) is formed on the entire surface of both sides of the fiber reinforced thermoplastic resin member (I). An integrated sandwich form and the like can be exemplified, and these can be designed according to the purpose.

  Moreover, it is preferable that skin material (III) is arrange | positioned at the interior material for aircrafts of this invention. That is, it is a portion constituting a substantial design surface of an aircraft interior material, and for example, a film shape, a plate shape, a non-woven fabric, a woven fabric, a mesh, etc., or a laminate of two or more of these can be used. This skin material (III) may be disposed on the surface of the fiber reinforced thermoplastic resin member (I), and is a member (II) composed of the fiber reinforced thermoplastic resin member (I) and the continuous fiber reinforced resin. May be arranged on the surface of the integrated member. As a preferred form of the aircraft interior material, on the aircraft structural member side, a layer of a member (II) composed of a continuous fiber reinforced resin that reinforces rigidity, then a layer of a fiber reinforced thermoplastic resin member (I), and a passenger cabin The laminated structure which consists of a layer of skin material (III) is mentioned by the side.

  Here, there is no restriction | limiting in particular in integration of each member, A well-known method can be used. For example, a fiber reinforced thermoplastic resin member (I) processed into a predetermined size in advance, inserted into a mold, and a fiber reinforced thermoplastic resin member (I) and a skin material (III) are simultaneously press-molded, An example is a method in which each member is individually manufactured and processed into a predetermined size and bonded with a generally known adhesive.

  From the viewpoint of design, the skin material (III) may have a geometric or non-geometric pattern. The geometric pattern is a pattern formed of a triangle, a rectangle, a rhombus, a polygon, a circle, or the like, or a combination of these. A non-geometric pattern is a pattern composed of letters, numbers, pictures, marks, etc., and a combination of these.

  The method for imparting a geometric or non-geometric pattern to the skin material (III) of the aircraft interior material is not particularly limited. For example, a method of using a skin material on which a pattern has been printed in advance. , A method of taking a pattern on the product surface of the mold, a method of inserting a part to be a pattern on the product surface of the mold and forming it integrally with a molding base material, drilling and cutting a molded product of an aircraft interior material The method of giving a pattern by secondary processing, such as the method of giving a pattern by plating, painting, vapor deposition, laser irradiation, etc. to the molded product of the aircraft interior material.

In the aircraft interior material of the present invention, a plurality of through holes may be formed in the molded product from the viewpoint of weight reduction. Here, the through hole is a hole penetrating in the thickness direction of the aircraft interior material including the skin material. The size of the through hole formed in the aircraft interior material, preferably 3000 cm ² or less, more preferably 2000 cm ² or less, more preferably 1500 cm ² or less. Moreover, the shape of the through hole formed in the aircraft interior material may be, for example, a circle, an ellipse, a polygon, or a polygon having a corner R, or two or more types may be used in combination. These through holes can be used as joint holes or window frames for aircraft interior materials.

  Examples of aircraft to which the aircraft interior material of the present invention is applied include fixed wing aircraft, airplanes, gliders, rotary wing aircraft, helicopters, auto gyros and other heavy aircraft, airships, and light aircraft such as balloons.

  The aircraft interior material of the present invention includes, for example, a captain seat, co-pilot seat, cabin crew seat, passenger seat, closet, cooking unit, restroom wall, baggage locker wall, storage locker wall, door lining, cabin ceiling Panel, cabin interior panel, cabin floor, underfloor cargo compartment ceiling panel, underfloor cargo compartment interior panel, cargo compartment floor, engine compartment interior panel, engine compartment ceiling panel, engine compartment floor, cockpit ceiling panel, cockpit interior panel, Applicable to cockpit floors, in-flight tableware, in-flight trays, etc.

  The aircraft interior material of the present invention will be described in more detail with reference to examples. However, the following examples do not limit the present invention.

  The method for measuring various characteristics of the aircraft interior material used in the description of the present invention is as follows.

(1) Void ratio A part of the molded product was cut out, and the void ratio (Vv) was measured according to JIS K 7075 (1991).

Vv = 100− (Vf + Vr)
Vf = Wf × ρc / ρf (unit: vol%)
Vr = (100−Wf) × ρc / ρr (unit: vol%)
Here, ρc is the density of the molded product, ρf is the density of the carbon fiber, and ρr is the density of the thermoplastic resin. Wf is the weight content (% by weight) of the carbon fiber of the molded product, and Wr is the thermoplastic resin weight content (% by weight) of the molded product. The density of the molded product was measured according to Method A (underwater substitution method) described in 5 of JIS K 7112 (1999). A test piece of 1 cm × 1 cm was cut out from the fiber-reinforced thermoplastic resin molded article, vacuum-dried at a temperature of 60 ° C. for 24 hours, and cooled to room temperature in a desiccator. Ethanol was used for the immersion liquid.

(2) Fiber length A part of the molded product was cut out and heated in air at 500 ° C. for 30 minutes in an electric furnace to sufficiently incinerate and remove the thermoplastic resin to separate carbon fibers. At least 400 separated carbon fibers are randomly extracted, and the length is measured to the unit of 1 μm with an optical microscope. The weight average fiber length (Lw) and the number average fiber length (Ln) are calculated by the following equations. Ask.
Weight average fiber length (Lw) = Σ (Li × Wi / 100)
Number average fiber length (Ln) = (ΣLi) / Ntotal
Li: measured fiber length (i = 1, 2, 3,..., N)
Wi: Weight fraction of fiber having fiber length Li (i = 1, 2, 3,..., N)
Ntotal: the total number of fibers measured for fiber length.

(3) Density The density was measured in accordance with Method A (underwater substitution method) described in 5 of JIS K 7112 (1999). Cut out a 1cm x 1cm test piece from the molded product, put it in a heat-resistant glass container, vacuum-dry this container for 12 hours at a temperature of 80 ° C, and cool it down to room temperature in a desiccator, taking care not to absorb moisture. A test piece was obtained. Ethanol was used for the immersion liquid.

(4) Dispersion parameter Part of the longitudinal section (the direction parallel to the thickness of the fiber reinforced thermoplastic resin member (I)) of the molded body was cut out and polished to prepare an observation test piece. The longitudinal section of the fiber reinforced thermoplastic resin substrate obtained by polishing is observed with an optical microscope, and a range of 0.1 mm × 0.1 mm is randomly selected at 10 locations, and the number of carbon fibers included in the range. Was measured. The average value of the number of selected 10 carbon fibers is n, the standard deviation is σ, and the variation (%) in the number of carbon fibers is obtained by the following formula.

Variation in the number of carbon fibers = 100 × σ / n
As an index of carbon fiber dispersibility in the fiber reinforced thermoplastic resin substrate (dispersion parameter of carbon fiber), the following four levels were evaluated. If it is ○○ and ○, the dispersibility of the carbon fiber is excellent and it passes.

  ◯: The variation in the number of carbon fibers is less than 20%.

  ○: Variation in the number of carbon fibers is 20% or more and less than 30%.

  Δ: Variation in the number of carbon fibers is 30% or more and less than 35%.

  X: The variation in the number of carbon fibers is 35% or more.

(5) Amount of generated gas A rectangular parallelepiped having a length of 76.2 mm and a width of 76.2 mm was cut out from the molded body to obtain a test piece. The amount of generated gas was tested according to ASTM E662-03. The sample burning time when measuring the amount of generated gas was 20 minutes. In the test, a specified chamber was used and heating was performed using an electric heater having a calorific value of 25 kW / m ² . The amount of gas generated is measured 6 times or more, and the average value is obtained by dividing the sum of the measured values by the number of measurements.

(6) Weight reduction by heating The weight reduction rate during heating of the thermoplastic resin to be used was measured under the following conditions using a thermogravimetric analyzer (TGA7 manufactured by Perkin Elmer). In addition, the sample used the fine granule of 2 mm or less.
Measurement atmosphere: Nitrogen (purity: 99.99% or higher) Sample flow weight: about 10 mg
Measurement condition:
(A) Hold for 1 minute at a program temperature of 50 ° C. (b) Increase the temperature from the program temperature of 50 ° C. to 400 ° C. In this case, the rate of temperature increase 20 ° C./min. Weight reduction rate ΔWr is obtained by using the above formula (1) from the sample weight when reaching 330 ° C. with reference to the sample weight at 100 ° C. in the temperature increase of (b). Calculated.

(7) Weight average molecular weight and number average molecular weight of polyarylene sulfide resin The molecular weight of the polyarylene sulfide resin was calculated in terms of polystyrene by gel permeation chromatography (GPC) which is a kind of size exclusion chromatography (SEC). The eluent was 1-chloronaphthalene, and measurement was performed with a differential refractive index detector under conditions of a column temperature of 210 ° C., a detector temperature of 210 ° C., and a flow rate of 1.0 mL / min.

(8) Bending characteristics and their fluctuation rate Select a flat part of the molded body, and test specimens for evaluation of bending characteristics with a size of 15 mm wide × 80 mm long, 5 in each of the arbitrary direction and 90 ° direction (total) 10 sheets). In accordance with ISO 178 method (1993), the obtained test piece is an Instron "Instron" (registered trademark) universal tester 4201 type as a tester, and the distance between fulcrums is 16 times the thickness of the test piece. And a bending test was performed at a test speed of 5 mm / min, and the bending elastic modulus and bending strength were measured. Using the average value a and the standard deviation σ of the number of measurements n = 10, the bending elastic modulus and the bending strength fluctuation rate were obtained using the following equations.

Fluctuation rate = 100 × σ / a
(Reference Example 1)
A copolymer mainly composed of polyacrylonitrile was spun and fired to obtain a carbon fiber continuous bundle A having 24,000 total filaments. The characteristics of this continuous carbon fiber bundle A were as follows.
・ Mass per unit length: 1.7 g / m
Specific gravity: 1.8 g / cm ³
・ Tensile strength: 5GPa
-Tensile elastic modulus: 235 GPa
-Surface specific carbon concentration O / C on carbon fiber surface: 0.1
-Sizing adhesion amount: 1.5 wt%.

(Reference Example 2)
Polyetherimide resin (GE Plastics, “URTEM1000” (registered trademark)) is immersed in liquid nitrogen for 3 minutes, and then pulverized by “AP-S” (product name) manufactured by Hosokawa Micron Corporation. Freeze crushed. The obtained pulverized particles were classified with a 14 mesh (opening diameter 1.18 mm) sieve, and the pulverized particles that passed through the 14 mesh sieve were further classified with a 60 mesh (opening diameter 0.25 mm) sieve and remained on the 60 mesh sieve. The pulverized particles were collected to obtain 14 to 60 mesh polyetherimide resin particles. The weight loss due to heating of the polyetherimide resin particles was 0.04%.

(Reference Example 3)
In a 1000 L autoclave, 42.7% sodium hydrosulfide 82.7 kg (700 mol), 96% sodium hydroxide 29.6 kg (710 mol), N-methyl-2-pyrrolidone (hereinafter abbreviated as NMP) 114. 4 kg (1156 mol), 17.2 kg (210 mol) of sodium acetate, and 100 kg of ion-exchanged water were charged, gradually heated to about 240 ° C. over about 3 hours while passing nitrogen at normal pressure, and passed through a rectifying column. After distilling 143 kg of water and 2.8 kg of NMP, the reaction vessel was cooled to 160 ° C. In addition, 0.02 mol of hydrogen sulfide per 1 mol of the sulfur component charged during this liquid removal operation was scattered out of the system.

  Next, 103 kg (703 mol) of p-dichlorobenzene and 90 kg (910 mol) of NMP were added, and the reaction vessel was sealed under nitrogen gas. While stirring at 240 rpm, the temperature was raised to 270 ° C. at a rate of 0.6 ° C./min and held at this temperature for 140 minutes. While 12.6 kg (700 mol) of water was injected over 15 minutes, it was cooled to 250 ° C. at a rate of 1.3 ° C./min. Thereafter, it was cooled to 220 ° C. at a rate of 0.4 ° C./min, then rapidly cooled to near room temperature, and further diluted with 200 kg of NMP to obtain a slurry.

  100 kg of slurry (B) heated to 80 ° C. is filtered at a 25 kg / 1 batch scale with a sieve (80 mesh, opening 0.175 mm), and granular polyphenylene sulfide (PPS) containing the slurry as a mesh-on component; About 75 kg of the second slurry was obtained as a filtrate component. Of the second slurry, 75 kg of 25 kg / 1 batch was charged into a devolatilizer and replaced with nitrogen, and after treatment at 100 to 150 ° C. under reduced pressure for 1.5 hours, 150 ° C., 1 Time treatment gave a solid. 100 kg of ion-exchanged water was added to the solid, and the mixture was stirred at 70 ° C. for 30 minutes to make a slurry again. This slurry was subjected to vacuum suction filtration with a filter having an opening of 10 to 16 μm. 100 kg of ion-exchanged water was added to the obtained white cake and stirred again at 70 ° C. for 30 minutes to make a slurry again. Similarly, after suction filtration, vacuum drying was performed at 70 ° C. for 5 hours to obtain 0.9 kg of a PPS mixture.

  500 g of the obtained PPS mixture was collected, and 12 kg of chloroform was used as a solvent, and the PPS mixture was contacted with the solvent by a Soxhlet extraction method at a bath temperature of about 80 ° C. for 3 hours to obtain an extract. The obtained extract was in the form of a slurry partially containing solid components at room temperature. Chloroform was distilled off from the extract slurry using an evaporator and then treated at 70 ° C. for 3 hours in a vacuum dryer to obtain 210 g of a solid (42% yield based on the PPS mixture).

  The solid thus obtained was confirmed to be a compound having a phenylene sulfide skeleton from an absorption spectrum in infrared spectroscopic analysis (apparatus; FTIR-8100A manufactured by Shimadzu Corporation). In addition, mass spectrum analysis (device: Hitachi M-1200H) of components separated from high performance liquid chromatography (device; Shimadzu LC-10, column; C18, detector; photodiode array), MALDI-TOF -Based on molecular weight information by MS and GPC, this solid is a mixture mainly composed of cyclic PPS having 4 to 12 repeating units, and the weight fraction of cyclic PPS is about 87%, and 13% is a linear PPS oligomer. And m = 13 or more of the cyclic PPS compound (Mw = 2000).

  The obtained cyclic PPS compound (prepolymer) was placed in an electric furnace adjusted to 300 ° C. in a nitrogen atmosphere, heated for 60 minutes, then taken out and cooled to room temperature. From the infrared spectrum, the product was found to be a PPS resin. The weight average molecular weight of the PPS resin was 61700, the dispersity was 1.94, and the weight loss rate ΔWr during heating was 0.075%.

  A predetermined amount of PPS resin was produced in the above manner, put into an extruder set at a cylinder temperature of 350 ° C., and pulled out with a sheet die to obtain a PPS resin film having a width of 1000 mm and a thickness of 0.3 mm.

Example 1
The carbon fiber continuous bundle A obtained in Reference Example 1 was cut with a cartridge cutter to obtain a chopped yarn having a fiber length of 6.4 mm. 4500 g of the chopped yarn obtained and 4500 g (Wf = 50 wt%) of the polyetherimide resin particles obtained in Reference Example 2 were entangled with carbon fibers by a papermaking method to form a web. The web length was 2000 mm and the width was 1000 mm.

  The obtained web was dried at 130 ° C. for 15 minutes to remove moisture, preheated in an electric furnace at a temperature of 390 ° C. for 5 minutes, and then the product surface of the mold has the logo “TORAY”. After placement in the interior material molding die, it was cooled and pressed at 80 ° C. for 3 minutes. After the resin was sufficiently solidified in the mold, it was demolded to obtain a fiber reinforced thermoplastic resin member (I) for aircraft interior having a weight of about 7.6 kg, a length of about 1900 mm, a width of about 900 mm, and a thickness of 3 mm. Moreover, when the state of the fiber reinforced thermoplastic resin member (I) was measured by the measurement method described above, the void ratio was 0%, the weight average fiber length (Lw) was 2.8 mm, and the fiber length distribution (Lw / Ln). 1.6 and density 1.49. When various characteristics were measured, the dispersion parameter was 8%, and the dispersion of the carbon fiber was good (evaluation was ◯◯). The amount of gas generated was 35, the flexural modulus was 35 GPa, the variation rate was 5%, the bending strength was 500 MPa, and the variation rate was 4%.

  After bonding a polyester design film as a skin material to the obtained fiber reinforced thermoplastic resin member (I), the molded product is processed into a predetermined shape by punching and includes the TORAY logo shown in FIG. An aircraft interior material was obtained.

(Example 2)
The carbon fiber continuous bundle A obtained in Reference Example 1 was cut with a cartridge cutter to obtain a chopped yarn having a fiber length of 6.4 mm. 900 g of the obtained chopped yarn was made into a web having a length of 1000 mm and a width of 1000 mm by a papermaking method. The web was dried at 130 ° C. for 15 minutes to remove moisture. Five webs were prepared in the same manner.

Five sheets of the PPS film obtained in Reference Example 3 cut to a length of 1000 mm were prepared, and alternately laminated with the web to obtain a preform. (Wf = 50% by weight)
The obtained preform was preheated in an electric furnace at a temperature of 300 ° C. for 5 minutes, placed in a baggage locker wall mold, and then cold-pressed at 130 ° C. for 3 minutes. After the resin was sufficiently solidified in the mold, the mold was removed to obtain a member (I) imitating a baggage locker wall having a weight of about 4 kg shown in FIG. The void ratio was 1%, the weight average fiber length (Lw) was 3.2 mm, the fiber length distribution (Lw / Ln) was 1.5, and the density was 1.54. When various characteristics were measured, the dispersion parameter was 9%, and the dispersion of the carbon fiber was good (evaluation was ◯◯). The amount of generated gas was 48, the flexural modulus was 34 GPa, the variation rate was 6%, the bending strength was 420 MPa, and the variation rate was 7%.

  The aircraft interior material of the present invention is not only lightweight and excellent in mechanical properties by using a carbon fiber reinforced thermoplastic resin, but also has a very low generation of toxic gas and is useful in terms of safety.

FIG. 1 is a schematic view of a cross section parallel to the thickness direction of a fiber-reinforced thermoplastic resin member (I) in which single-fiber carbon fibers are dispersed in a thermoplastic resin. FIG. 2 is a schematic view of a cross section parallel to the thickness direction of the fiber-reinforced thermoplastic resin member (I), in which carbon fibers are present in a bundle state. FIG. 3 is a perspective view of an aircraft interior material according to an embodiment of the present invention. FIG. 4 is a perspective view of an aircraft baggage locker wall according to an embodiment of the present invention.

Explanation of symbols

1: Carbon fiber monofilament 2: Thermoplastic resin 3: Window frame 4: Non-geometric pattern of skin material

Claims (13)

The carbon fiber (A) having a weight average fiber length (Lw) in the range of 1 to 15 mm was dispersed into the thermoplastic resin (B) in a single fiber form with a weight content of 25 to 80% by weight. An aircraft interior material including a fiber reinforced thermoplastic resin member (I) as a component, and a flexural modulus measured by the ISO 178 method of the fiber reinforced thermoplastic resin member (I) is in a range of 20 to 50 GPa. And the interior material for aircrafts whose generated gas amount at the time of 20-minute combustion measured by ASTM E662 is in the range of 0-100. The aircraft interior material according to claim 1, wherein a dispersion parameter of the carbon fiber (A) is in a range of 0 to 30%. The aircraft interior material according to claim 1 or 2, wherein a ratio (Lw / Ln) of the weight average fiber length (Lw) to the number average fiber length (Ln) of the carbon fibers is in a range of 1 to 4. The aircraft interior material according to any one of claims 1 to 3, wherein weight loss of the thermoplastic resin (B) by heating satisfies the following formula.
ΔWr = (W1-W2) /W1×100≦0.18 (%)
(Here, ΔWr is the weight loss rate (%), and thermogravimetric analysis was performed at a temperature rising rate of 20 ° C./min from 50 ° C. to an arbitrary temperature of 330 ° C. or higher in a non-oxidizing atmosphere at normal pressure. (It is a value obtained from the sample weight (W2) when reaching 330 ° C. based on the sample weight (W1) when reaching 100 ° C.) The said thermoplastic resin (B) is at least 1 sort (s) selected from polyetheretherketone resin, polyetherimide resin, polyether sulfone resin, and polyarylene sulfide resin. Aircraft interior materials. The thermoplastic resin (B) is a polyarylene sulfide resin, and the polyarylene sulfide resin has a degree of dispersion represented by a weight average molecular weight / number average molecular weight of 2.5 or less. Aircraft interior material. The aircraft interior material according to any one of claims 1 to 6, wherein a void ratio of the fiber-reinforced thermoplastic resin member (I) is in a range of 0 to 5%. The aircraft interior material according to any one of claims 1 to 7, wherein a bending elastic modulus has a variation rate of 0 to 20%. The aircraft interior material according to any one of claims 1 to 8, wherein a bending strength measured by an ISO 178 method of the fiber reinforced thermoplastic resin member (I) is in a range of 200 to 1000 MPa. The aircraft interior material according to claim 9, wherein a bending strength variation rate is in a range of 0 to 20%. The aircraft interior material according to any one of claims 1 to 10, wherein a density of the fiber-reinforced thermoplastic resin member (I) is in a range of 1.3 to 1.8. Furthermore, the aircraft interior material according to any one of claims 1 to 11, wherein the member (II) made of continuous fiber reinforced resin is integrated. Furthermore, the aircraft interior material according to any one of claims 1 to 12, wherein the skin material (III) is integrated.

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